Extract the tarball to some directory of your choice.
Change into the directory and run:

python setup.py build
python setup.py install –prefix=/some/where

If you wish to pull down the github version you can use pip:

pip install git+https://github.com/ajmendez/PyMix.git

It is now part of pypi:

pip install pymix

After the installation is completed I would recommend to run
mixtureunittests.py to check whether everything is in order.

To get the GSL on OSX I recomend using homebrew to build the universal
package so that it works with both the i386 version in EPD:

brew install gsl –universal

Documentation:

Example code for most aspects of the library can be found in
the pymix/examples subdirectory and mixtureunittest.py.
Automatically generated documentation for the module is available
on the Pymix home page www.pymix.org.